Wall-plaster.



UUIVII'UOI I IUIO, V

COATING R PLASTIC.

aaeaea UNITED STATES PATENT OFFICE.

JAMES EDWIN FAIRFAX, 0F AIKEN, SOUTH CAROLINA, ASSIGNOB 0F ONE-HALF TODAVID WILLIAM GASTON, 33., OF AIKEN, SOUTH CAROLINA.

WALL-PLASTEB.

No Drawing.

To all whom it may concern:

Be it known that I, JAMES EDWIN FAIR- FAX, a citizen of the UnitedStates, and a resident of Aiken, in the county of Aiken 5 and State ofSouth Carolina, have invented a new and Improved Wall-Plaster, of whichthe following is a full, clear, and exact description.

My invention has reference to a composition of matter which forms a Wallplaster or stucco.

The object of the invention is to provide an inexpensive plaster whichis fireand waterproof, which will not peal ofi', and

which will give a very smooth-finish surface.

The base of the plaster is tripoli, which is as cheap as, if not cheaperthan, sand. Being very fine it ermits the formation of a very smooth surace.

The tripoli must be fully dried before the plaster is formed. To thetripoli cement is added, preferably, Portland cement, fibrous materialto increase the binding quality of the plaster, preferably mineral woolbeing used, and 1i ht bluestone CuSO .5H O to accelerate cence. t 1Wsulfate, which normally contains five particles of water, is heated itloses its water of 80 crystallization and even that of constitution.

Roasted copper sulfate when moistened becomes very 0 an n s to assumeits original color, that is, absorbs or accumulates the water ofcrystallization. This eculiar 85 faculty of copper sulfate is utilize inthis composition to facilitate tl 1 s ettin of same. The aboveingredients are use In substantially the following proportions: 4

ripoli 1500 pounds or 74.77% Portland cement 500 or 24.92% Mineral woo16 or .30

. Bluestone (preferably roasted)--- 1 ounce or .01

The dry tripoli, Portland cement, mineral wool and bluestone are placedin a dry mixture and mixed for from five to ten minutes and then put inbags ready for shipping.

Specification of Letters Patent.

a 1 copper tially as specified.

Patented June 18, 1918.

Application filed August 18, 1917. Serial No. 186,959.

The tri oli is like y er finmsand, and owing the mortar what theplasterers call a long stroke and makes the mortar work easily and itdoes not waste. It is fireand waterproof. The Portland cement causes thehardening of the mass. The mineral wool also helps to harden the massand binds it, as it may be said, to form a very thin skeleton in thebody of the plaster.

This plaster sets in a reasonable time in very cold weather, which makesit very useful for exterior wall plastering.

If the composition is to be used as a stucco, the first coat should beput on good and heav it should be well scratched, and then drie outfully before putting the second 65 coat on. The second coat must also beheavy, well rodded, darbed,'and floated. The last coat is finishedeither with a trowel or float. For the last coat it is preferable to useAtlas White Portland cement in place of ordinary cement, the proportionsremaining the same.

While I have given relative proportions of the ingredients used formaking the plaster or stucco, I do not want to be limited to thoseproportions, as slight variations in the 16 proportions ma be madewithout materially affecting the e ciency of the composition.

I claim:

1. A plaster consisting of a mixture of tripoli, cement, mineral wool,and bluestone, so

in proportions substantla y'as specified.

2. A laster' consisting of a mixture of Portlan cement, tripoli, mineralwool, and roasted bluestone, in proportions substan- 3. A plasterconsisting of a mixture of tripoli, a binder, fibrous substance, androasted bluestone in proportions substantially as specified.

4. A plaster consisting of a mixture of in- 9a fusorial silica, cement,mineral wool, and coppensulfate inproportions substantially asspecified.

JAMES EDWIN FAIRFAX.

copies of this patent may be obtained tor nve cents each, by aidreningthe "Commissioner 0! intents,

Washington, D. 0.?

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